C.I.Reactive Blue 21

Copper;33-[[4- (2-hydroxyethylsulfonyl) phenyl]sulfamoyl]-2,11,20,29,39,40-hexaza-37,38-diazanidanonacyclo[28.6.1.13,10.112,19.121,28.04,9.013,18.022,27.031,36]tetraconta-1,3 (40),4 (9),5,7,10,12 (39),13 (18),14,16,19,21,23,25,27,29,31 (36),32,34-nonadecaene-6,15,24-trisulfonic acid

C1=CC(=CC=C1NS(=O)(=O)C2=CC3=C(C=C2)C4=NC5=NC(=NC6=NC(=NC7=C8C=C(C=CC8=C([N-]7)N=C3[N-]4)S(=O)(=O)O)C9=C6C=C(C=C9)S(=O)(=O)O)C1=C5C=C(C=C1)S(=O)(=O)O)S(=O)(=O)CCO.[Cu+2]